Quantum computer using silicon quantum dot

Charles Tahan, Yun-Pil Shim, Rusko Ruskov

Teck Seng Koh

Feiyang Ye, Ammar A. Ellaboudy, Dylan Albrecht +3 more

Quantum computers are susceptible to noise. In silicon quantum computers, random electrical fluctuations in the semiconductor can disturb qubits based on individual electrons. However, little is known about the causes of these electrical fluctuations. Here, the authors zoom in and study individual charge fluctuators in silicon quantum dots and observe a variety of new phenomena. The results promise to help understand and mitigate charge noise in silicon quantum computers.

Jun Yoneda

Shimaa. S. Abdelfattah

Quantum computer has a great attention all over the world, several attempts to construct it by supposing a theoretical or experimental model for qubit which is the basic unit of quantum computer. Qubit is formed from two level physical system, So, semiconductor quantum dot is suitable for qubit where qubit state formed from superposition between two spin states , silicon (Si) quantum dot is one of suitable system for qubit and quantum logic gate because of its long coherence time. In this work, we study theoretical model of quantum dots from silicon (Si) which coupling through superposition and entanglement mechanism to form quantum logic gate. we have investigated magnetic field effect on exchange interaction by using two approximate methods Hund – Mullikan (HM) and Hitler – London (LH) for calculation and evaluation of the exchange interaction coupling , also study the influence of inter – dots distance on the exchange coupling. From investigation of exchange interaction, silicon quantum dots is the best suitable for quantum logic gate.

M. Vinet